Niektóre kwestie definicyjne związane z pomiarem zjawiska migracji. Co oznacza termin „migrant”?

The paper aims at presenting some methodological difficulties resulting from the absence of a sufficiently precise definition of a migrant. Gathering data on contemporary migrants becomes then a unquestionable challenge. The paper analyses recommendations on how to gather such data, as well as reports addressing an issue of migration. Different approaches to how to understand crucial notions such as a long-term and a short term migrant are presented. The paper addresses also various typologies of migrants. One of the documents presented is Recommendations on Statistics of International Migration, published by United Nations Statistics Division. The author quotes a suggested there definition of an international migrant, as opposed to one of an international visitor. Recommendations analyse also the question of usability of available data sources, such as population registers, or border statistics. It seems that all of them are burdened with certain inaccuracies, and none allows creating a precise holistic picture. In conclusion, the author states that further research in this field, also of a linguistic-methodological character, appears of the utmost importance, as the phenomenon of migration becomes one of the crucial factors shaping the contemporary world.